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1991 Mercedes-Benz 300E

Question: What is the cause of a knocking sound in the rear left of vehicle?

Question

Cal Bear 1990, Sacramento, CA, February 23, 2012, 10:59

Enthusiast

I hear a knocking sound in the rear left side of the car, only when I accelerate from a dead stop, or when I take a corner at below 20 mph. I don't otherwise hear the sound on a smooth road or over a bump. My car has 188,000. First time I've heard this noise. Never had struts or shocks replaced. Brake inspection was negative. Is this a strut and shock issue?

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Answer #1

csubak30 February 23, 2012, 11:19

Master

Definetly sounds like a shock issue. 188,000 miles and they really need replaced anyway. I would recommend you have both of the rears replaced. Better to replace in pairs.

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Cal Bear 1990, February 23, 2012, 21:31

Enthusiast

Thanks. A leaking shock was the culprit. I replaced the struts and shocks, all around. $900.

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Answer #2

Prestige Auto Works (127 Answers) , Sacramento, CA - (916) 436-3251
Prestige Auto Works February 23, 2012, 11:21

Journeyman

An inspection would be necessary to determine the exact cause of your knocking sound. Shocks and struts are recommend to be replaced every 50-80,000 miles. If they have never been replaced, that would be a beneficial repair to start with. There could also be other damaged suspension parts due to the high mileage.

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